Aeroplane propeller



Au .12, 1930. V.RI- \NTA 1,772,521

AEROPLANE RROPELLER Filed April 23, 1929 2 Sheets-Sheet lx Aug. 12, 1930. v RANTA 1,772,521

AEROPLANE PROPELLER Filed April 25, 1929 2 Sheets$heet 2 Inventor 720707" 220 2a in A tiorney atented Aug. 12, 1930 UNITED squares vrc'ron mm, or ATLANTA, enonem AEROPLANE PROPELLER Application filed April as,

crafts may attain greater speed without increasing the fuel consumption necessitated I by the conventional propellers of present day 15 use.

Another very important object of the invention is to provide a propeller of this type, which is simple in construction, may be readily and easily constructed, strong, dur- 2 able and thoroughly efficient and practicable in use.

Other objects and advantages of the invention will become apparent during a study of the following description, taken in connection with the accompanying drawings,

wherein;

Figure l is a front end elevation of the propeller. Figure 2 is a rear end elevation of the propeller.

Figure 3 is a side view of the propeller and a fragmentary portion of the hull of an air craft in which the propeller is operatively journaled and arranged.

Figure 4 is a detail sectional view taken through the propeller.

Figure 5 is a sectional view taken on line 55 of Figure 3, and looking in the direction of the arrows. I

Referring to the drawings more in detail it will be seen that my improved propeller comprises a cone shaped center portion 5 and having a forward apex coincident with the propeller axis as clearly shown in Figure 3.

The cone shaped center portion 5, to be hereinafter referred to as the base is of hollow construction and has mounted therein a shafting 6, which shafting 6 projects through an opening formed in the wall 7 of the base as clearly shown in Figure 4. The shafting 6 1929. Serial No. 357,573.

is provided on its outwardly projecting end with a socket 8 to receive a rotatable part of the air craft mechanism for rotating the propeller. A plurality of blades 9 radiate from thebase 5, and are disposed thereon in a1; oblique 'manner. These blades of course radiate from the base 5 in predetermined spaced relation, and are preferably formed of a flexible material. A trifurcated bracket comprising the legs a, b and 0 is secured at the juncture of the leg to the cone shaped base at the apex thereof as is indicated at 10. The'legs a, b and .0 are each bent intermediate their ends so as to provide the leg portions 12 which extend at right angles to the longitudinal axis of the base and the leg portions 12 which extend inwardly of the propeller and axially of the base to terminate evenly with the inner end of the base and suitably spaced from the base. The leg portion 12 is fixed at its extremity to one end of a supporting member 13 as at 14, which supporting member 13 extends through the base as at 14 to be fixed to the shafting 6 adjacent its socketed end and 7 flush against the inner surface of the wall 7 of the base as shown in Figure 4. Thus it will be seen that since the inner side of the blade along its leading edge is fixed to the cone shaped base extending obliquely of the longitudinal axis of the'base from the point of the propeller to the-- peripheral edge thereof, and the blade is then bent as shown in Figure 3 so that the leading edge of the blade on the other two sides may be fixed to the leg portion .12 and 12 respectively as indicated in dotted lines in Figure 1 forming a substantially right angular blade at the forward edge thereof. When the blade is arranged in this manner it will be seen that the blade declines rearwardly from the leading edge portion fixed to the portion 12' to merge into an arcuate trailing edge 15. Bracing members 16', each having one end fixed as at 17 to the wall 7 of the base adjacent the peripheral edges thereof and at spaced intervals' a's shown in Figure 2, and their opposite ends fixed to the respective legs a, b and c as at 18.

From the foregoing then it will be seen that I provided a propeller comprising a central portion of conical formation and the ropeller blades radiating therefrom so ormed as to be substantially cup-shaped and radiating from the base in spaced relationand at approximately 180.

While I have herein shown and described the preferred embodiment of my invention, it is to be understood that the invention is susceptible to changes coming within the spirit of the inventionvand the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l 1. A propellercomprising a cone shaped base, a trifucated bracket fixed to the base at the-apex of the base, the legs of the bracket being bent intermediate their ends to provide a leg portion extending at right angles to the longitudinal axis of the cone, and a second leg portion extending axially of the cone and spaced therefrom, a plurality of blades radiating from the base and arranged in alternate relation to the legs of the bracket, each of said blades being of substantially elongated recspectively,

ranged in alternate relation with respect to the le s of the trifucated brackets, each of said blades being bent adjacent their opposite ends to provide a pair of spaced arallel end members, means for securingt e free edges of the end members to the cone and last mentioned leg portion of the bracket reand that portion of the blade intermediate the said ends having one ed e fixed to the last mentioned leg portion of t e respective leg brackets! In testimony whereof I afiixmy si nature.

VICTOR RA TA.

tangular formation, and having one end fixed to the outer face of the cone and the opposite end fixed to thelast mentioned leg portion, and the intermediate portion of the blade bent forwardly and adapted to be fixed tothe first mentioned leg portion of the bracket.

2. .A propeller comprising a "cone shaped center, a trifucated bracket fixed to the cone at the apex thereof, the legs of the bracket being bent intermediate their-ends to provide a leg portion extending at right angles to the longitudinal axis of the cone, and a sec- 0nd leg portion extending axially of the cone and spaced therefrom, a plurahty of blades radiating from the cone and arranged in alternate relation to the legs of the brackets, each of said blades being of substantially elongated rectangular formation, and having one end fixed tothe outer face of the 'cone and extending obliquely with respect'to the longitudinal axis of the cone from the apex of the cone to the inner peripheral edge thereof,

the opposite ends of the respective blades being fixed to the said second leg portion, the

v intermediate portion of the blade being bent forwardly and adapted to be fixed to the first mentioned leg portion, and said intermediate portion of the blade extending rearwardly to merge into an arcuate trailing edge substantially as described.

3. A. propeller comprising a cone shaped center, a trifucated bracket fixed to the cone at the apex thereof, the legs of the bracket being bent intermediate their ends to provide a leg portion extending at right angles to the longitudinal axis of the cone, and a second leg portion extending axially of the cone and spaced therefrom, supporting members ra- 

